10
Applications Information
On-Resistance and Derating Curves
The Output On-Resistance, R
(ON)
, speci ed in this data
sheet, is the resistance measured across the output
contact when a pulsed current signal (Io=1A) is applied
to the output pins. The use of a pulsed signal (≤ 30ms)
implies that each junction temperature is equal to
the ambient and case temperatures. The steady-state
resistance, Rss, on the other hand, is the value of the
resistance measured across the output contact when
a DC current signal is applied to the output pins for
a duration sufficient to reach thermal equilibrium.
Rss includes the e ects of the temperature rise in the
device.
Figure 1. Maximum Output Current Rating vs Ambient Temperature
(ASSR-1510-003E)
Figure 2. Maximum Output Current Rating vs Ambient Temperature
(ASSR-1511-001E)
Derating curves are shown in Figures 1, 2, 3 and 4,
specifying the maximum output current allowable for
a given ambient temperature. The maximum allowable
output current and power dissipation are related by the
expression Rss=Po(max)/(Io(max))
2
from which Rss can
be calculated. Staying within the safe area assures that
the steady state MOSFET junction temperature remains
less than 125°C.
Turn On Time and Turn O Time Variation
The ASSR-15xx Series exhibits a very fast turn on and
turn o time. Both the turn on and turn o time can
be adjusted by choosing proper forward current as
depicted in Figures 12 and 14. The changes of the turn
on and turn o time with ambient temperature are also
shown in Figures 13 and 15.
Figure 3. Maximum Output Current Rating vs Ambient Temperature
(ASSR-1511-001E DC Connection)
Figure 4. Maximum Output Current Rating vs Ambient Temperature
(ASSR-1520-002E and ASSR-1530-005E)
0
0.5
1
1.5
2
-40 -20 0 20 40 60 80 100
T
A
- TEMPERATURE - °C
I
O
- OUTPUT CURRENT - A
Safe
Operating
Area
I
F
= 10mA, 4-Layer Board
0
0.2
0.4
0.6
0.8
1
-40 -20 0 20 40 60 80 100
T
A
- TEMPERATURE - °C
I
O
- OUTPUT CURRENT - A
Safe
Operating
Area
I
F
= 10mA, 4-Layer Board
0
0.2
0.4
0.6
0.8
1
-40 -20 0 20 40 60 80 100
T
A
- TEMPERATURE - °C
I
O
- OUTPUT CURRENT - A
I
F
= 10mA, 4-Layer Board
0
0.2
0.4
0.6
0.8
1.0
-40 -20 0 20 40 60 80 100
T
A
- TEMPERATURE - °C
I
O
- OUTPUT CURRENT - A
I
F
= 10mA, 4-Layer Board
1-Channel
Safe
Operating
Area
2-Channel
Safe
Operating
Area